//弹出/隐藏遮罩层背景禁止/允许互动
	var window_scroll=0;
	var window_scroll_history=0;
	$(window).scroll(function(){
		window_scroll=$(window).scrollTop();
	})
	function body_scroll_stop(){
		setTimeout(
			function(){
				window_scroll_history=window_scroll;
				$("body").css({"position":"fixed","top":-window_scroll_history,"min-height":"100%"});
			},500
		)
	}
	function body_scroll_start(){
		setTimeout(
			function(){
				$("body").css({"position":"","top":"","min-height":""});
				$(window).scrollTop(window_scroll_history);
			},500
		)
	}